Rim-section for expansible pulleys.



PATENTED DEG. 5, 1905.'

Ivo-:806,181

, @JQMJEJL RIM SECTION-POR EXPANSVIBLB PULLEYS.

' APPLIOATION FILED 11:13.23, 1905.

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` NITED STATE-s PATEivr` oEEicE.

' CHARLES REED, OF PHILADELPHIA, PENNSYLVANIA.

v-Rlwleslvcll'lpoN FOR EXPANSIBLE PULLEYS.

Specification .of Letters Patent.

' Patented Dec. 5, 1905 Application filed February 23, 1905-. Serial No. 246,963-

To a/ZZ whom `t may concern:

Beit known that I, CHARLES J. REED, a citivzen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Rim Sections for Expansible Pulleys, of which the following is a specification. p i

In United States Patents Nos. 758,47 4 and 758,561, granted to me April 26, 1904, I have shown expansible pulleys each drum of which comprises a set of radially-adjustable rim-'sections the ends of which pass through radial slots :in circular guide-plates and have teeth entering spiral grooves in circular adjusting-disks. Both the sides and the teeth of such rim-sections ordinarily fit somewhat loosely in the guide-slots and spiral grooves lto prevent undue friction and binding ofthe sections as they are shifted to vary the diameter of the drum. This looseness permits 'the rim-sectionswhich are not beneath the belt to be thrown slightly outward by. cen' trifugal action; butl the pressure of the belt again forces them against the inner walls of the grooves. Each rim-section thus moves slightly forward and inward .during every revolution of the pulley, and this movement occasions unnecessary noise and wear. In United States Patent No. 783,311, granted to me February 21, 1905, I have shown a rim- .section for pulleys ofv this type which isprovided with resilient toothed ends to frictionally engage the sides of the guide-slots. Thesel rim-sections operate without noise, the fric- 'tional engagement preventing the sections from being thrown outward by centrifugal action. Each section, however, has four separate toothed members, which are permanently secured together, and these teeth require accurate fittingto enable them to move smoothly in the adjusting-grooves.

The present invention is an improved rimsection for eXpansible pulleys, which consists of separate notched members, each member having a belt-receiving surface and toothed ends. 'Ihe sections may'consist of two or more members, the. outer members prefere ably having flanges to carry the belt. The separate members may be made of thin resilient material, easily punched and llanged, and no accurate fitting is required, since the separate members can shift relatively, and thus adjust themselves in the spiral grooves. The outer members are preferably bent so that their toothed ends frictionally engage the sides of the guide-slots, while the inter-V mediate member or members are held in place bythe pressure of thev outer ones;

Referring to the accompanying drawings, Figure 1 is a perspective view of a rim-section consisting of two members;

3 is anend view of the rim-section shown 1n Fig; 1. Fig. 4 is-an end view of a rim-section consisting of two outer and two-intermediate members, and Fig. 5 is a plan view of one end of the rim-section shown in Fig.4.

of two separate matched members 1 2, preferably punched 'outof sheet-steel, each of The section shown in Figs. 1, 2, 3 consists` Fig. 2 is a plan view of the rim-section shown in Fig. 1. Fig.

which comprises a flanged belt-receiving portion '3, a body 4, and toothed ends 5. The bodies are preferably punched with a series of holes 6 to lighten them. Each member is slightly bent atits middle, so that the bodies of the two members diverge from their mid- -dle to the toothed ends 5. The ends are pressedtogether before inserting them in the guide-slots of the pulley, and thus bear frictionally against the sides of the slots, preventing their movement by centrifugal-force.

The two 'members being separate and uncon- .consisting of separate matched members,

each membervhaving a belt-receiving surface' and toothed ends, as set forth.

2. A `-rim-section for expansible pulleys, comprising two separate matched members, each member having a flanged belt-receiving portion and toothedends, as set forth.

3. A rimesection for expansible pulleys,

' consisting of separate outer members and an intermediate member or members, each member having toothed ends, and said outer mem bers each having a flanged belt-receiving portion', as set forth.

A thicker rim-section is thus ICO IIO

4. A rim-section for expansible pulleys, comprising two separate matched members of resilient material, said members each having a-belt-receiving surface and toothed ends and being slightly sprung apart at their ends, as set forth.

5. A rim-section for expansible pulleys, comprising two separate matched members of resilient material, said members each hav- Io ing a flanged belt -receiving portion and toothed ends, and being slightly sprung apart at their ends, as set forth.

6. A rim-section for eXpansible pulleys,

CHARLES J REED. Witnesses:

H. W. ROGERS, J. W. RITTER. 

